Flared Fitting Nut, Application Chemical, Refrigeration, Fitting Thread Size 3/4 In.-16, Flare Angle 45 Degrees , Fitting Material Brass, Hex Size 7/8 in, Maximum Operating Pressure 2,800 psi, Maximum Operating Temperature 250 Degrees F, Overall Length 1 in, Specific Fitting Shape Nut, Compatible Auto Systems Adapters, Fuels, Natural Gas, Propane, Refrigerant Lines, Compatible Tube Outer Diameter 1/2 in, Standards SAE J512, SAE J513, Compatible Tube Material Aluminum, Brass, Copper, Welded Steel